Temperature control system for backlight module
a temperature control system and backlight module technology, applied in lighting devices, electrical devices, light sources, etc., can solve the problems of insufficient color light of liquid crystal displays, loss of brightness, and even crash of lcds, so as to reduce the brightness of light-emitting modules, slow the temperature rise speed, and reduce the temperature
Inactive Publication Date: 2009-08-06
UNITED RADIANT TECHNOLOGY CORPORATION
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Benefits of technology
[0007]The primary objective of the present invention is to modulate the brightness of light sources to prevent from heat accumulation when the quantity of light sources is increased to enhance the brightness of a backlight module lest high temperature lower the performance or shorten the lifetime of related materials and electronic elements so that the service life of an LCD module can be prolonged.
[0008]To achieve the abovementioned objective, the present invention proposes a temperature control system for a backlight module, which applies to a backlight module with the light source quantity of the light-emitting module being increased to directly promote the brightness of LCD. The temperature control system for a backlight module of the present invention comprises: a light-emitting module used to provide brightness for the backlight module; at least one thermistor used to detect the temperature of the backlight module; and a control circuit receiving the signals of the thermistor and controlling the brightness output of the light-emitting module to modulate the temperature of the backlight module so that the temperature rising speed slow down or the temperature gradually descend.
[0011]For a backlight module with the light source quantity of the light-emitting module being increased to directly promote the brightness of LCD, the present invention can timely modulate the brightness of the backlight module to slow the temperature rising speed or gradually lower the temperature via the detection function of the thermistor and the PWM control of the control circuit. Thereby, the prevent invention can prevent from the malfunction caused by the heat accumulation and temperature rising in LCM (Liquid Crystal Display Module). Further, the present invention can also prevent from the high-temperature-induced performance downgrade and service life decrease of related materials and electronic elements.
Problems solved by technology
As the intensity of the color light of the liquid crystal display is insufficient, the colors are covered by the scattered light or reflected light of the external light source.
However, light sources generate heat.
High temperature causes that contrast decreases or even that LCD crashes because electronic elements overheat.
However, the abovementioned methods decrease color number and lower color purity, which affects the quality of images.
Besides, the products of the reflective design cannot work in an environment of insufficient lighting.
Method used
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[0014]Below, the technical contents of the present invention will be described in detail in cooperation with embodiments. However, it should be understood that the embodiments are only to exemplify the present invention but not to limit the scope of the present invention.
[0015]Increasing light sources of the backlight unit is the most direct way to greatly promote the brightness of LCM. However, the more the light sources, the more the heat accumulated. Further, the longer the turn-on duration of the backlight unit, the higher the temperature of LCM. High temperature causes that contrast decreases or even that LCD crashes because electronic elements overheat.
[0016]Refer to FIG. 1 for a temperature control system of a backlight module according to the present invention, which applies to the backlight module with the light source quantity thereof being increased to directly promote LCD brightness. The temperature control system for the backlight module of the present invention compris...
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The present invention discloses a temperature control system for a backlight module, which applies to a backlight module with the light source quantity of the light-emitting module being increased to directly promote the brightness of LCD. The present invention can timely modulate the brightness of the light-emitting module to slow the temperature rising speed or gradually lower the temperature via the detection function of the thermistor and the PWM control of the control circuit. Thereby, the prevent invention can prevent from the malfunction of electronic elements or the decrease of service life caused by heat accumulation in the light-emitting module.
Description
FIELD OF THE INVENTION[0001]The present invention relates to a temperature control system for a backlight module, particularly to a temperature control system, which can timely lower the brightness of a backlight module according to the detection result of a thermistor.BACKGROUND OF THE INVENTION[0002]Liquid crystal is an orderly-arranged organic compound having the characteristics of a solid and a liquid. When liquid crystal is heated to a certain temperature, it becomes a transparent liquid. When liquid crystal is cooled to a certain temperature, it becomes a cloudy solid. Because of the abovementioned characteristics, the name “liquid crystal” is assumed. In a liquid crystal display (LCD), liquid crystal is enclosed in a glass casing. When an electric field is applied to liquid crystal, the orientation of liquid crystal molecules is changed, and the orientation change of liquid crystal molecules further varies the optical characteristic thereof. The applied electric field, in coo...
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CPCH05B33/0854H05B41/2856H05B33/089H05B45/56
InventorHUANG, WEI-HAOYU, MING-YEN
OwnerUNITED RADIANT TECHNOLOGY CORPORATION